Trouble Activating Tilt Compensation on Facet FPM-T

Positioning and Navigation
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I assume you have the device on the end of a 1.8m pole. If this is not correct, let us know.

Is d3.4 RC expected to fully support IM19 firmware 1140 on the FPM‑T?

Nice work! There was a bug in v3.3 that was causing problems with tilt. You are successfully on d3.4 which should work.

Is there another required step, setting, or calibration after the update?

Generally no. An RTK Fix is necessary before initialization (which you’ve got). Once the device is rocked back and forth, tilt should activate. The sound is faint and may be hard to hear over ambient noise. We recommend using the movement of the location dot in SW Maps to recognize when tilt is working. So in SW Maps: the dot will move as you rock the device back and forth. Once tilt is activated, the dot will stop moving as you tilt the device.

Does Tilt sensor configuration complete prove that the IM19 is operating, or only that it communicates during startup?

Thanks for capturing this output! It shows us the device is detected and configured but doesn’t tell us anything further. There is no default serial output when tilt is activated or running. However, if you enable System->Hardware->Print Tilt/IMU Debugging you will see additional output like below:

Rover Accuracy (m): 0.006, SIV: 32 GNSS State: RTK Fix
Batt (99%): Voltage: 8.25V Discharging: 0.00%/hr
Tilt STARTED Status: 0xA1C0001 - RTK Fix
Status: Unknown status bits set: 0x1C0001
Tilt STARTED Status: 0xA1C0001 - RTK Fix
Status: Unknown status bits set: 0x1C0001
Rover Accuracy (m): 0.006, SIV: 32 GNSS State: RTK Fix

From here, you can watch the Tilt module move through its initialization steps as you rock it back and forth.

What diagnostic log or test would distinguish a remaining firmware issue from a defective IM19 module?

See above. The fact that the IMU is online and responding to configuration would indicate it’s working, however I can’t yet explain why it’s not enter compensation mode.

Separately, is the FPM‑T Wi‑Fi station failure with both a 2.4 GHz extender and Android hotspot a known issue?

Let’s keep that discussion over here.